基于PCI设备的DMA传输建模与分析

A Modeling and Analysis of DMA Based PCI

针对当前高速数据采集系统对速率和精准度等方面越来越高的要求,介绍了一种基于DMA传输的PCI接口数据采集卡,重点阐述了利用新型驱动开发模型WDF实现中断和DMA传输技术相结合来采集LVDS信号的驱动程序开发过程,并将DMA与普通传输模式进行对比分析,实验结果表明,该方法下的数据传输速率可达到80MB/s,经过反复测试证实,该套设备稳定可靠,完全满足当前需求。

In view of current high-speed data acquisition system has higher requirements in the area of speed and accuracy,the paper introduces a PCI interface data acquisition card based DMA,focuses on driver development process of the combining technologies of interrupt and DMA to collect LVDS signal used WDF,and compares the DMA transfer mode with the general one,finally analysis the experimental results,it shows that the data transfer rate using DMA reach 80 MB / s,after repeated testing,the equipment is stable and reliable,fully meet the current needs.